Installed a new 1406 on my 63 Avanti. Prior to that had the Carter which i simply couldn't get tuned properly. Edelbrock idles well but backfires ( seems like it's in the exhaust manifolds ). At normal cruising no backfiring. Have been thru the normal diagnostics - timing is 24 degrees BTDC. The backfiring increases at around 4000 RPM and the car jerks. Any ideas what else to check?
Thanks
Steve
Thanks
Steve
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